86 PROCEEDINGS OF THE ACADEMY OF 



thorax and head are much more finely punctured, the elytra smooth, scarcely 

 striate and the intermediate rows of smaller punctures scarcely evident. Ex- 

 cepting the obtusa, this is the most depressed of our Trogositse. 



13. T. sinuata, nigro-picea nitida, depressa, cap'te thoraceque sat 

 parce punctatis, hoc latitudine paulo breviore, postice parum angustato, lateri- 

 bus late rotundatis, postice sinuati?, margine fortius reflexo, angulis posticis 

 rectis, basi sinuatim truncata, elytris oblongis, basi late emarginatis, humeris 

 rectis, striis punctatis haud impressis, interstitiis planis. parce rugulosis, bi- 

 seriatim subtiliter punctulatis, antennispedibusque piceo rufis, abdomioe pros- 

 ternoque parces subtiliter punctulatis gula amice vix punctulata, postice, laeve 

 nitida. Long. -28. 



T. sinuata Lee. Proc. Acad. Nat. Sci. 1861, p. 344. 



East of Fort Colville, one specimen ; Mr. Gibbs. This species resembles in 

 appearance T. corticalis MeU'., and several others from the Atlantic States, 

 but is easily known by the thorax being less transverse and less narrowed be- 

 hind, with the hind angles more prominent, and the base not rounded, but 

 nearly truncate and sinuate, and slightly eraarginate at the middle. 



B 3. 



14. T. cue uj i form is, rufa, valde depressa, capite thoraceque parce 

 grosse punctatis, hoc lateribus rotundatis, antice latiore. postice parum angus- 

 tato, margine vix reflexo, angulis posticis parvis, obtusis, basi rotundato, elytris 

 oblongis, humeris rectis, basi vix emarginatis, striis punctatis, interstitiis 

 planis, parce rugulosis, biseriatim subtiliter punctulatis, abdomine subtiliter 

 punctulatis prosterno grosse punctato, gula antice punctulata, postice trans- 

 verse plioata. Long. -20. 



One specimen, Pennsylvania ; Dr. Le Conte. This is the most depressed spe- 

 cies of the group. Its upper surface is flat, much more so than in any other 

 known species. The thorax is about one half wider than long, with the sides 

 moderately rounded, scarcely converging posteriorly. 



15. T. nigrita, nigro-picea subnitida, modice depressa, capite thoraceque 

 parce grosse punctatis, hoc lateribus rotundatis, margine fortiter reflexo, angu- 

 lis posticis obtusis, basi rotundato, elytris oblongis, humeris rectis, basi late 

 emarginatis, striis punctatis, interstitiis convexis, rugulosis, biseriatim subtili- 

 ter punctulatis, gula antice grosse punctata, postice laevi, prosterno parce sub- 

 tiliter punctulato, abdomine confertim punctulata. Long. -22 30. 



Kansas, two specimens ; Dr. Le Conte. This species resembles the cast a- 

 nea, Mels. It may be readily distinguished by the less transverse thorax, the 

 more reflexed margin and more rounded sides. The interstrial spaces are more 

 convex and rugulose than in either of the two succeeding species. 



16. T. castaoea, nigro-picea, modice depressa, capite thoraceque con- 

 fertim subtiliter punctulatis, hoc lateribus rotundatis, margine reflexo, angulis 

 posticis obtusis parvis ; basi vix rotundato, elytris eloogato-ovalibus basi vix 

 emarginatis, striis punctatis, interstitiis modice convexis rugulosis, biseriatim 

 subtiliter punctulatis, gula antice parce grosse punctata, postice laevi, prosterno 

 parce punctata, abdomine confertim punctulato. Long. -42. 



T. castanea, Mels. Proc. Acad. ii. 109. 



T. bremcolli", Dej. Catalogue (?) 



Texas, common. This is the broad depressed species so common in our 

 Southern State?. The thorax is broader than in the preceding species, and is 

 less deeply and coarsely punotured. 



17. T. 1 a ti co 11 is, nigro-picea, modice depressa, capite thoraceque confertim 

 subtiliter punctulatis, hoc transverso, latitudine duplo breviore, lateribus ro- 

 tundatis, margine reflexo basi rotundato, angulis posticis obtusis parvis, elytris 

 oblongo-ovalibus, basi vix emarginatis, humeris rectis. striis puuetatis, inter- 

 net). 



